Telescopic bushing



Patented Dec. 12, 1939 UNITEDl vsrrrrzlas vA'ilrNfl oFFI-er.

Joseph P. Marx, Hartford, Wis.

Application December 19, 1938, Serial No. 246,685

1 Claim.

The invention relates to bushings adapted for sealing the space between telescoping members and more particularly to a telescoped bushing consisting of a plurality of nested bands or sleeves.

An object of the invention is to provide a nested or telescoped bushing with novel means to facilitate easy assembly and to effect tight sealing..

Another object is to provide a telescoped bush- .r ing sleeve with novel structural features to aiord substantially uniform contraction of a portion thereof without interrupting or disturbing the uniform continuity thereof.

The foregoing and such other objects of the l invention as will appear hereinafter, will be more readily understood from a perusal of the following specification, in which reference will be madel to the accompanying drawing; wherein:

Fig. 1 is a longitudinal sectional View of the 2o telescoped bushing, showing it in use.

Fig. 2 is a perspective view of one of a plurality of substantially identical sleeves.

Fig. 3 is a sectional'view taken substantially on line 3--3 of Fig. 1.

25 Fig. 4 is a perspective view of a sleeve embodying modified features.

Fig. 5 is a sectional view showing another form of telescoped bushing.

As best shown in Figs. 1 to 3, inclusive, the tele- :lo scoped bushing indicated as a whole at Il, is

intended primarily to seal the annular space between telescoping tubular members l2 and i3. Inasmuch as the amount of annular space between such members may vary in different in- 35 stallations, it is desirable that the bushing conv stitute a plurality of sleeves l. As shown, the sleeves i4, making up a completed bushing, are made of lsheet metal bands sized to telescopically nest snugly one within the other and to fit .10 into the space between the telescoping members I2 and I3.

Obviously, to provide non-yieldable bands or sleeves would require extreme accuracy, both in the manufacture and in the fitting of the var- 45 ious sleeves tovconstitute a satisfactory complete bushing. Accordingly, it is necessary that the sleeves be made to contract but slightly when associated with each other. The ability of telescopic sheet metal sleeves to contract maybe tu effected byr splitting each band over its entire length but it is evident in such instance that escape of gases from the joint sought to be sealed will result. Contraction of the sleeves without sacrificing sealing, is accomplished in an inex- 55 pensive and practical manner as shown and described. This may be accomplished by providing each sleeve preferably with two longitudinal substantially diametrically opposite slots l5 and |5a, each of which extends inwardly from one end of said sleeve to a point short of the opposite end, 5 which end preferably is flared outwardly as at i5. This leaves a continuous annular portion Il adjacent said flared end.

Mere provision of the two longitudinal slots `lli and la however, does not adequately impart the correct iiexibility, to the sleeve. It is apparent that when asleeve is slotted'longitudinally only, as above noted, each arcuate portion defined by said slots remains rigidly joined to the unslotted portion, hence any movement of said slotted portions is transmitted to the unslotted portion with the result that the latter portion is distorted slightly. This results in leakage. Substantially uniform distortion of the slotted portion, without the slightest'distortion 20 of the annular sealing portion Il or flared portion i 6, is permitted by cutting the sleeve circumferentially, as at I8, for a distance preferably less thanhalf its circumference. The circumferential cut preferably is joined substantially midway its l ends with the longitudinal slot 15a.. This structure effectively provides the sleeve `with a -contractible portion `of considerable area while the continuity of the unbroken sealing portion I'l and the flared portion I6 is not disturbed. 30

To assemble, one sleeve is driven into theaother until the adjacent unbrokenvannular sealing portions I'l are in substantially alignment and the marginal flares 56 abut. Contraction of the slotted portionsdoes not disturb the continuity or the uniform true diameter of the unslotted portions, hence a leakproof seal is provided.

In the disclosure of Fig. 4, a continuous sleeve constructed substantially like the sleeve of Fig. 2 is shown. In this embodiment, a circumferential 40 cut 3 is provided at the inner end of each longitudinal slot l5 to increase contractibility. If desired, a similar arrangement may be provided on the flared marginal flange It. As shown, one slot m extends inwardly from the eared end of the sleeve and terminates in a short circumfer- .ential out 2l whereby the flared portion may be also contracted without disturbing the uniform annular sealing portion Il.

In Fig. 5 a structure substantially like those 50 v just described, is shown. Here each sleeve has an herein are illustrative rather than restrictive; and that, it is not desired to be limited to the precise structural details but only insofar as may be required by the present state of the art and the 5 scope of the appended claim.

I claim:

A bushing comprising a nest of graduated telescoping sleeves adapted to seal the annular space between tubular members of different size, said sleeves having a snug surface fit, throughout substantially their full length, with either the inside or the outside of one of the other of said sleeves or with one of said members, said sleeves tractible sealing band portion adjacent said other 10 end of the sleeve.

JOSEPH P. MARX. 

